Hello all. I am new to this forum and find it very helpful. Has anyone that sent their AT in for the upgrade noticed that it was really chattery when they got it back? When i first got my AT Pro it was really quiet and ran smooth. I used it in an old field and it hardly made a noise until it hit a good target, My first old coin find was an 1877 indian head. Since i sent it out for the upgrade it has been really noisy. It makes noise all over in the same field that it was quiet in before. I have tried different freq,gb both auto and manual and turning the sens down. Still the same thing and Garrett tells me its normal. Anyone have the same problem or any ideas?